Answers

Subtract 9/20 from 50/21

1^st number: 2 8/21, 2^nd number: 9/20

50/21 - 9/20 is 811/420.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   50/21 = 50 × 20/21 × 20 = 1000/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   9/20 = 9 × 21/20 × 21 = 189/420
4. Subtract the two like fractions:
   1000/420 - 189/420 = 1000 - 189/420 = 811/420
5. In mixed form: 1391/420

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